81296415 has 48 divisors (see below), whose sum is σ = 147154176. Its totient is φ = 41472000.

The previous prime is 81296407. The next prime is 81296447. The reversal of 81296415 is 51469218.

81296415 is a `hidden beast` number, since 8 + 1 + 2 + 9 + 641 + 5 = 666.

It is not a de Polignac number, because 81296415 - 2³ = 81296407 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

Its product of digits (17280) is a multiple of the sum of its prime factors (720).

It is a self number, because there is not a number n which added to its sum of digits gives 81296415.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 140607 + ... + 141183.

It is an arithmetic number, because the mean of its divisors is an integer number (3065712).

Almost surely, 2^81296415 is an apocalyptic number.

81296415 is a deficient number, since it is larger than the sum of its proper divisors (65857761).

81296415 is a wasteful number, since it uses less digits than its factorization.

81296415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720 (or 717 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 81296415 is about 9016.4524620274. The cubic root of 81296415 is about 433.2020118179.

The spelling of 81296415 in words is "eighty-one million, two hundred ninety-six thousand, four hundred fifteen".